![]() ![]() What they still do today, is to position the panel under test horizontal above a bass speaker ( in that case they use KEF B139). So if you intend to refurbish Quad panels or build new ones with the same dimensions this should put you very close to Quads specifications.Ĭoming to your question, Quad uses an indirect method to achieve, respectively to monitor the desired resonance. This is only valid if the tensioned area is in the vicinity of some 40 by 80 cm. If you apply these values you will be very close to the original way Quad is tensioning their panels. So, each weight is about 1,5kg for the mid/high and 2kg for the bass. I have seen the original jig, which is now in Germany, and if I recollect correctly they have 30 weights. The original Quad stretching jig uses steel weights which total to 45kg for the mid/high-panel and some 60 kg for the bass-panels. What counts is the resonance frequency, that surely depends on several factors such as material and material thickness, mass, dimensions and the foil tension after the foil is glued to its frame and the weights are released. The tension itself is not a value of interest. Your question is certainly interesting to everyone who refurbishes or builds electrostatic panels. ![]()
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